Structural, thermal and dielectric properties of low-alkali borosilicate glasses for electronic applications

Enhanced Sinterability, Thermal Conductivity and Dielectric Constant of Glass-Ceramics with PVA and BN Additions

“…On the other hand, the highest dielectric constant, of 4.43, was obtained for the G6BN@770. The obtained dielectric constants of the glass-ceramics were also comparable to the results of the bulk glass sample itself (4.07-4.50 at 1 MHz) [41]. The obtained results were compared to commercially produced LTCC glass-ceramics sintered at 800-900 • C, which also used B 2 O 3 to lower the sintering temperature.…”

“…Table 4 shows the dielectric properties of the samples sintered at 770 °C. It was observed that the dielectric constant of the glass itself (G@770) was relatively low and dielectric loss was relatively high in comparison to the reference work [ 41 ]. This was attributed to the closed porosities that were present in the microstructure, since microstructural flaws increase dielectric loss and the decrease dielectric constant [ 46 , 47 ].…”

“…However, it was shown that the use of glass-ceramics with BN is a more effective way to contribute to composites than AlN by comparing their thermal conductivity values with different glass-ceramic content [33]. Table 4 shows the dielectric properties of the samples sintered at 770 • C. It was observed that the dielectric constant of the glass itself (G@770) was relatively low and dielectric loss was relatively high in comparison to the reference work [41]. This was attributed to the closed porosities that were present in the microstructure, since microstructural flaws increase dielectric loss and the decrease dielectric constant [46,47].…”

“…High-purity (>99%) starting materials were mixed and melted at 1500 °C for 1 h. The subsequent glass melt was quenched by water to obtain frits. The glass preparation method details are given in [ 41 ]. The obtained glass was milled and sieved to reach a particle size of <20 µm.…”

“…Average density values of sintered products were determined in ethanol using the Archimedes method by taking three iterative measurements for each sample. Relative Archimedes density (%) was found by dividing average experimental density (obtained by Archimedes method) by the bulk density of the glass-ceramic (2.02 g/cm 3 ) [41] produced and multiplied by 100. Next, apparent porosity was found by Equation (1), where the average density was the measured experimental density obtained via the Archimedes method and dimensional density was the density calculated by dividing the mass of the prepared samples by their volume.…”